Roll stand for cold working of rolled steel in rod or wire form

ABSTRACT

In a device wherein rod or wire is cold worked to provide it with one or more series of ribs thereon by being passed through three profile rolls simultaneously pressing against the rod or wire, a single drive is provided for said profile rolls, comprising a primary drive shaft and two secondary drive shafts at 60* to each other and to the primary drive shaft. Each of the shafts for the profile rollers is driven from its corresponding primary or secondary drive shaft and each of said shafts for the profile rollers is pivotally mounted with respect to its primary or secondary drive shaft. Means are provided to releasably hold the pivotally mounted profile rollers against the rod to be worked regardless of variations in diameter along the length of such a rod.

1451 May 14, 1974 [54] 383553352? igd gwggg km FOREIGN PATENTS OR APPLICATIONS 1,140,088 7/1957 France 226/187 [75] Inventor: Erich Elle, Glehn, Germany [73] Assignee: Bau-Stahlgewebe GmbH, Primary Examiner-Powell Larson Dusseldorf-Oberkassel, Germany Attorney, Agent, Firm-Greene & [22] Filed: Mar. 30, 1972 [57] ABSTRACT [21] Appl. No.: 239,685

In a device wherein rod or w1re 1s cold worked to prot vide it with one or more series of ribs thereon by being [30] Apphcatlon Pnonty Data passed through three profile rolls simultaneously P 3, 1971 Germany 2116426 pressing against the rod or wire, a single drive is provided for said profile rolls, comprising a primary drive [52] US. Cl ..1 72/194, 72/224, 72/246 haft and two secondary drive shafts at 60 to each [51] Im. C1. B2111 8/00, B21b 13/10 other and to the primary drive Shaft Each of the 1 1 Field of Search shafts for the profile rollers is driven from its corre- 137 sponding primary or secondary drive shaft and each of said shafts for the profile rollers is pivotally mounted [56] Ref ren es C t d with respect to its primary or secondary drive shaft. uNlTED STATES PATENTS Means are provided to releasably hold the pivotally 3,182,206 6/1965 Gillberg 72/194 mounted fQ F the rod to be Wmked 2,094,920 10/1937 ["8166 I I 72/224 regardless of varlations 1n dlameter along the length of 1,481,886 1/1924 Berg 226/177 such a 2,525,500 10/1950 Collins 226/177 3,014,628 12/1961 Littlehale 226/177 5 Clams, 5 Drawing Figures III 9 7 1 1 1 l9 -1 25 27\; I l ,7 6 6 g f Z6 I Y 1 1 1 22 1 1 1 1 1 =1 1v a 27 I V UM 1 5 F K: I t 24 1 l- 38 1 1 q i 111 I I ,2, It l 29 20 PATENTEU MAY 14 I974 SHEEI 1M4 Fig. 1

PATENTEDMM 14 1914 I swan 2 or 4 Fig. 2

ROLL STAND FOR COLD WORKING OF ROLLED STEEL IN ROD OR WIRE FORM The invention relates to aroll stand for the cold working of rolled steel in rod or wire form of the type wherein three opposing profile rollers are arranged around the circumference of the to-be-worked rod at intervals of 120 and which rollers are provided with grooves for the production of a profile on the rod surface.

Such an arrangement is employed for the manufacture of reinforcing rods for concrete wherein the required ribs for increased adhesion to the concrete are produced by a cold rolling process. For the manufacture of such rod it is customary to prestrengthen the rod or wire before bringing up the profiling step. This is done generally by drawing through a die whereby the diameter of the wire is simultaneously equalized. The pulling force necessary for the drawing is provided by a driven drawing wheel, which in part also serves for the winding of the treated wire.

In order to diminish in part the considerable wear on the drawing die, one can arrange around the wire, idling rollers whose surfaces circumscribe a diameter which is less than the rod diameter, so that likewise a hardening of the rod is obtained when it is pulled through these rollers.

In the profiling of rods or wires it is possible to allow the necessary force for pulling through the rollers to draw the wire or rod through the die serving for equalization of the rods or wires. In such a way directly driven rib rollers overcome the problem that the individual rollers must be radially adjustable with respect to the rod axis, in order to make possible, on the one hand, an adjustment for the differing diameter of the wire or rod-and, on the other hand, to guarantee the replacement of the profile rolls.

In this interrelation it is known to drive each profile roller with an electric motor or by hydraulic power. With both these driving possibilities, no absolute synchronism of the profile rollers is possible, so that it is not possible in such-an arrangement to produce a pattern of ribs in series along the length of the rods so that they are situated along a common spiral and to a certain degree along a'screw winding.

An object of the invention, to find a practical way of bringing about by a cold working process a uniform series of screw pitched or proportionately offset ribs of like quality on the surface of rods of different diametors.

The invention obtains this object by a roller stand which introduces to the art the following, that the primary drive shaft drives two beveled gear drives and therethrough two secondary drive shafts arranged at angles of 60 to the primary drive shaft and that gears connect the resultant three drive shafts to the shafts of the profile rollers and the shafts of the'rollers are supported around the three drive shafts by pivotable connecting arms.

For pivoting, each of the connecting arms can be flexibly connected to its own connecting rod which is arranged essentially parallel to the axis of the rod to-beworked, which connecting rod is pivoted on a guide bushing which is fastened to a concentric (with respect to the wire) arranged hollow adjusting spindel and is adjustable along the same in the longitudinal direction of the rod or wire to be worked. Thereby the connecting rods can be formed as turnbuckles, making possible the separate adjustability of the individual profile rolls. The guide bushing on the adjusting spindel is appropriately slidingly held under the pressure of a spring element with the effect that the pressure of the profile rolls on the wire is against the springelement and can be balanced for eventual diameter inaccuracy.

The adjusting spindle itself is appropriately adjustable in the longitudinal direction of the wire by means of a worm drive.

The advantage of the invention essentially is obvious, in that by means of a single mechanical means a synchronization of the profiling process is attained, which guarantees a proportionate precise forming of the work pieces over the whole circumference and an additional adjusting limits most extensively inproportionate form ing. In contrast to the multiple motor driven profile rolls, the central drive possesses generally a more favorable performance efficiency.

Further features and advantageous properties of the invention will be apparent from the following description when considered with the accompanying drawing illustrating an example of operation thereof.

In the drawing:

FIG. I is a front elevational, cross sectional, view taken transversely of the axis of the rod corresponding to line I-I of FIG. 2.

FIG. 2 is a side cross sectional view taken lengthwise of the axis of the rod corresponding to line llIl of FIG. I. Y

FIG. 3 is a side view partly cut away taken lengthwise of the axis of the rod corresponding to line Ill-Ill OF FIG. 1.

FIG. 4 is a cross sectional view taken on line IVIV of FIG. 2. I

FIG. 5 is a force parallelgram for the construction of the pressing action of the ribbed rollers.

The roller stand ofthe invention will, as will be noted from FIGS. l4, be driven through primary drive shaft 8 from a speed regulatable electric motor I or from another suitable drive arrangement, the secondary drive shafts 9 and 10 being driven through the bevel gear pairs 19 and 20. The gear wheel pairs 21, 22 and 23 mounted on drive shafts 9, 8 and I0, and adjacent drive shafts 25, 24 and 26, the profile rolls 7, 6 and 5 being mounted on the latter shafts.

The drive shafts 8, 9 and 10 are rotatingly supported in the roll stand 38 by means of bearing pairs 28, 27 and 29 in planes parallel to the shafts 24, 25, 26, the latter holding profile rollers 6, 5 and 7, respectively in position with their peripheries approximately in contact with their surfaces at about to each other.

Connecting arms 2, 3, 4 arearranged respectively on the coordinated drive shafts 8, l0 and 9 so as to swivel about the axle shaft 8a, 10a and 9a (FIG. 5). The swing of the connecting arms 2, 3 and 4 results by means of improved tie bars l4, l5, 16 (FIG. 2) which have one end attached to connecting arms 2, 3 and 4 and the other end pivotally mounted on guide bushing 13 by bolts 30, 31 and 32.

The guide bushing 13 is slidingly fastened to an adjusting spindle l7 and is urged to the left as shown in FIG. 3 through a lock nut 33 (fixed to spindle 17) by means of a spring element 12 exerting pressure from its disk shaped spring heads against the collar-like guide bushing 13. The adjusting spindle 17 itself, which is moveably mounted in the roller stand wall 38 and the housing 18 and can be displaced axially with respect to the axis 11 of wire 11a by means ofa worm gear 35 and its worm 36 acting as a spindle nut.

The feed of the rod or wire 11a to the profile rolls 5, 6, 7 takes place in the direction of the arrow (FIG. 2) through the bore 37 of the adjusting spindle 17. To this end, in order to introduce the rod unhindered, first the profile rollers 5, 6, 7 are swung out radially from the drive shafts 8, 9, around the axes 8a, 9a and 16a in a direction at right angles to the rod axis 11 by an amount depending on the diameter lla of the rod.

Should an interchange of profile rollers 5, 6, 7 be made necessary through wear or changeover from a first rod dimension to another, they can be swung out to about 90 with respect to the axis of the drive shaft 8, 9, 10. Herethrough is a broader working area provided which makes possible a fitting or changeover of rod or work tool without difficulty.

The forwarding of the profile rolls 5, 6, 7 for the rod lla takes place retrogressively. Owing to radial delivery movement the three profile rollers 5, 6, 7 come into operation simultaneously upon the surface of rods 11a for the design. Following upon penetration of the profile rolls into the surface of the rods as a result of the elbow lever operation (FIG. 5) and the formation through cold working, lines of ribs are produced wherein the ribs proceed either along a spiral line or displaced with respect to one another in any symmetrical way.

Special features of the invention are the close fitting, deep adjustment ofthe profile rolls 5, 6, 7 which are set in motion only through a single device and the registration arrangement, as well as the automatic adjustment, working against the spring element 12, of the profile rolls which pivot with each variation of the rod diameter along the length of the rod. v

The invention reveals furthermore the possibility of attaining an exact cross cut of the rods travelling through the apparatus, depending on the roll-off diameter and the angle of rotation of the profile rolls 5, 6 and 7 in connection with a measuring-device, by way of example an angle of rotation potentiometer. By

means of a suitable steel shears for rods, which is controlled from an angle of rotation potentiometer permits cutting of the rod depending on the size. In doing so, itis expedient to couple the angle of rotation potentiometer to one of the three drive shafts.

l claim:

1. Roll stand for cold working of rolled steel in rod or wire form of the type where the to-be-worked rods are passed through three profile rollers at to each other and wherein indentations on the rollers for the profiling of the surface of the rod are provided and wherein the profile rollers are adjustable toward and away from the axis of the rods, characterized in that a first primary drive shaft drives second and third secondary drive shafts through two bevel wheel drive means, said second and third secondary drive shafts being at angles of 60 to the primary drive shaft, gear means coupling said first, second and third drive shafts to the respective shafts of the profile rolls, and first, second and third connecting arms carrying the respective drive shafts of the profile rolls, said arms being pivotally connected around and first, second and third drive shafts respectively.

2. Roll stand as claimed in claim 1 characterized in that each of the connecting arms is connected to a corresponding connecting rod substantially parallel to the axis of the to-be-worked rod, which connecting rods are linked to a guide bushing which is fastened onto a hollow control spindle substantially concentric to the rod to-be-worked and alongwhich it is shiftable longitudinally with respect to the rod.

3. Roll stand as claimed in claim 2 characterized in that the connection rod is formed as a turn-buckle.

4. Roll stand as claimed in claim 2 characterized in that the guide bushing on the adjusting spindle is slidably fastened with respect to said spindle through the intermediate connection with a spring element.

5. Roll stand as claimed in claim 2 characterized in that the control spindle is displaceable by means of a worm gear in a direction lengthwise of the rod to-beworked. 

1. Roll stand for cold working of rolled steel in rod or wire form of the type where the to-be-worked rods are passed through three profile rollers at 120* to each other and wherein indentations on the rollers for the profiling of the surface of the rod are provided and wherein the profile rollers are adjustable toward and away from the axis of the rods, characterized in that a first primary drive shaft drives second and third secondary drive shafts through two bevel wheel drive means, said second and third secondary drive shafts being at angles of 60* to the primary drive shaft, gear means coupling said first, second and third drive shafts to the respective shafts of the profile rolls, and first, second and third connecting arms carrying the respective drive shafts of the profile rolls, said arms being pivotally connected around and first, second and third drive shafts respectively.
 2. Roll stand as claimed in claim 1 characterized in that each of the connecting arms is connected to a corresponding connecting rod substantially parallel to the axis of the to-be-worked rod, which connecting rods are linked to a guide bushing which is fastened onto a hollow control spindle substantially concentric to the rod to-be-worked and along which it is shiftable longitudinally with respect to the rod.
 3. Roll stand as claimed in claim 2 characterized in that the connection rod is formed as a turn-buckle.
 4. Roll stand as claimed in claim 2 characterized in that the guide bushing on the adjusting spindle is slidably fastened with respect to said spindle through the intermediate connection with a spring element.
 5. Roll stand as claimed in claim 2 characterized in that the control spindle is displaceable by means of a worm gear in a direction lengthwise of the rod to-be-worked. 